Keyboard



FIG. 1 us a top perspective view of a keyboard depicting the design;

FIG. 2 is right-side elevational view of the keyboard depicting thedesign; and,

FIG. 3 is a front perspective view of the keyboard depicting the design.

Broken lines shown in the drawings illustrate portions of the keyboard,and form no part of the claimed design.

The ornamental design for a keyboard, as shown and described.